Weekly update 28

Yan Cui

I help clients go faster for less using serverless technologies.

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Hi, welcome to another weekly update.

Bye bye, DAZN!

Yesterday was my last day at DAZN.

I’m fortunate and grateful to have had the chance to play a very small part in the growth of DAZN over the last 12 months. The product is doing fantastically well. It became the top-grossing sports app in the world, and year-on-year revenue was up a staggering 950%!

Most of all, I feel privileged to have met and worked with some of the most talented and capable people in the industry. And I’m sad to part ways with them.

Over the last 6 months, DAZN has been very kind to accommodate me and allowed me to reduce my involvement to 3 days a week. This gave me the opportunity to ease my way into a new career as an independent consultant. Thankfully, many of you responded and I was able to work with a number of clients to help them on their journey to serverless. I have thoroughly enjoyed working with different clients, understanding and solving problems in different domains.

The experience has also opened my eyes to a wider range of contexts and constraints that different clients have to work within. I’m sure, in time, it’ll make me a much better problem solver and I want to do more of it! Which is why I made the difficult decision to leave DAZN in order to pursue a career as an independent consultant full time.

If you’re interested in working with me, you can find out more about the services I can provide, as well as to get in contact with me through this page.

Going forward, I’ll also be splitting my time between Amsterdam and London. My wife is starting a new job in Amsterdam, so we’ll shortly be migrating to Amsterdam as a family (with our cat Ada, whom many of you met on my video course!). But as most of my clients are based in London, I’ll be taking the short flight between London and Amsterdam almost on a weekly basis.

We held our first-ever internal tech conference

Just before I left DAZN, I took part in our first-ever internal tech conference. We had a number of internal as well as external speakers and covered everything from microfrontends and serverless, to dealing with the imposter syndrome.

My contribution was a talk on the value of experimenting in the cloud and doing so in a tasteful manner (i.e. don’t put your experiments into production!). It’s a topic that is very close to me, and one of my favourite past-times. I shared a number of interesting experiments that the serverless community has done, and some ideas and learnings that we can take from them.

As my colleague, Richard McIntyre summed up in one sentence – “be curious, ask a question and run with it”. This simple rule has been the driving force for my whole career and I would recommend it to anyone!

New posts

AWS Lambda: how to detect and stop accidental infinite recursions. In this post, I discussed the danger of accidentally triggering an infinite recursion of Lambda invocations. It’s a problem that has hit several members of the serverless community, and is an easy mistake to make! As such, we (DAZN) has incorporated a middleware into our dazn-lambda-powertools project to detect and stop infinite recursions.

Serverless app to speed up all your Lambda functions. I continued my collaboration with Lumigo to bring you even more opensource tools to make it easier for you to build serverless applications. This time, we open sourced two separate tools:

  • autodeploy-layer: a Serverless Application Repository (SAR) app to automate the deployment of Lambda layers. Now, it’s easy to roll out a new version of a layer that your functions depend on. You just need to a) deploy this SAR app to your region, and b) tag the functions that need the layer.
  • optimized-aws-sdk: a version of the AWS SDK with HTTP keep-alive enabled. Which, you can conveniently deploy to all your functions that use the AWS SDK with the autodeploy-layer app ;-)


I gave a talk on Serverless and FinDev at the National DevOps Conference this week, you can find the slides for the talk below.

Whenever you’re ready, here are 4 ways I can help you:

  1. Production-Ready Serverless: Join 20+ AWS Heroes & Community Builders and 1000+ other students in levelling up your serverless game. This is your one-stop shop for quickly levelling up your serverless skills.
  2. Do you want to know how to test serverless architectures with a fast dev & test loop? Check out my latest course, Testing Serverless Architectures and learn the smart way to test serverless.
  3. I help clients launch product ideas, improve their development processes and upskill their teams. If you’d like to work together, then let’s get in touch.
  4. Join my community on Discord, ask questions, and join the discussion on all things AWS and Serverless.